:root {
    /* Dynamic colors - will be updated by JS */
    --nb-gray-900: #111827;
    --nb-gray-700: #374151;
    --nb-gray-300: #d1d5db;
    --nb-gray-100: #f3f4f6;
    --nb-white: #ffffff;
    --nb-blue: #3b82f6;
    --nb-blue-dark: #2563eb;
    --nb-orange: #f59e0b;
    --nb-red: #ef4444;
    --nb-green: #10b981;
    --nb-accent-pink: #ec4899;
    --nb-accent-cyan: #06b6d4;

    /* Spacing & UI */
    --nb-spacing-xs: 4px;
    --nb-spacing-sm: 8px;
    --nb-spacing-md: 12px;
    --nb-spacing-lg: 16px;
    --nb-radius: 6px;
    --nb-shadow-neo: 4px 4px 0 var(--nb-gray-900);
    --nb-transition: 0.2s ease;
    --nb-font-mono: 'IBM Plex Mono', monospace;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--nb-gray-100);
    font-family: var(--nb-font-mono);
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    transition: background-color 0.5s ease;
}

.nb-login-wrapper {
    width: 360px;
    padding: var(--nb-spacing-lg);
    background: var(--nb-white);
    border: 4px solid var(--nb-gray-900);
    box-shadow: var(--nb-shadow-neo);
    transition: all 0.5s ease;
}

.nb-login-header {
    margin-bottom: var(--nb-spacing-lg);
    text-align: center;
}

.nb-login-header h2 {
    font-size: 24px;
    margin: 0;
    color: var(--nb-gray-900);
    transition: color 0.5s ease;
}

.nb-login-form {
    display: flex;
    flex-direction: column;
    gap: var(--nb-spacing-md);
}

.nb-form-group {
    display: flex;
    flex-direction: column;
}

.nb-form-label {
    font-weight: bold;
    color: var(--nb-gray-900);
    margin-bottom: var(--nb-spacing-xs);
    transition: color 0.5s ease;
}

.nb-input {
    padding: var(--nb-spacing-sm);
    border: 3px solid var(--nb-gray-900);
    background-color: var(--nb-gray-100);
    font-size: 14px;
    font-family: var(--nb-font-mono);
    transition: all 0.5s ease;
}

.nb-btn-submit {
    padding: var(--nb-spacing-sm) var(--nb-spacing-lg);
    background-color: var(--nb-blue);
    color: var(--nb-white);
    font-weight: bold;
    font-size: 14px;
    border: 3px solid var(--nb-gray-900);
    cursor: pointer;
    box-shadow: var(--nb-shadow-neo);
    transition: var(--nb-transition);
}

.nb-btn-submit:hover {
    background-color: var(--nb-white);
    color: var(--nb-blue-dark);
    border-color: var(--nb-blue-dark);
    box-shadow: none;
}

.nb-login-footer {
    margin-top: var(--nb-spacing-md);
    text-align: center;
    font-size: 12px;
    color: var(--nb-gray-700);
    transition: color 0.5s ease;
}

.nb-login-footer a {
    color: var(--nb-blue-dark);
    text-decoration: underline;
    transition: color 0.5s ease;
}

.color-cycle-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 8px 16px;
    background-color: var(--nb-gray-900);
    color: var(--nb-white);
    border: 3px solid var(--nb-gray-900);
    font-family: var(--nb-font-mono);
    cursor: pointer;
    box-shadow: var(--nb-shadow-neo);
    transition: all 0.3s ease;
}

.color-cycle-btn:hover {
    background-color: var(--nb-white);
    color: var(--nb-gray-900);
}